git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/instance.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2006-2009 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37
  38 #include <libmemcached/common.h>
  39
  40 static inline void _server_init(memcached_instance_st* self, Memcached *root,
  41                                 const memcached_string_t& hostname,
  42                                 in_port_t port,
  43                                 uint32_t weight, memcached_connection_t type)
  44 {
  45   self->options.is_shutting_down= false;
  46   self->options.is_dead= false;
  47   self->options.ready= false;
  48   self->_events= 0;
  49   self->_revents= 0;
  50   self->cursor_active_= 0;
  51   self->port_= port;
  52   self->fd= INVALID_SOCKET;
  53   self->io_bytes_sent= 0;
  54   self->request_id= 0;
  55   self->server_failure_counter= 0;
  56   self->server_failure_counter_query_id= 0;
  57   self->weight= weight ? weight : 1; // 1 is the default weight value
  58   self->io_wait_count.read= 0;
  59   self->io_wait_count.write= 0;
  60   self->io_wait_count.timeouts= 0;
  61   self->io_wait_count._bytes_read= 0;
  62   self->major_version= UINT8_MAX;
  63   self->micro_version= UINT8_MAX;
  64   self->minor_version= UINT8_MAX;
  65   self->type= type;
  66   self->error_messages= NULL;
  67   self->read_ptr= self->read_buffer;
  68   self->read_buffer_length= 0;
  69   self->read_data_length= 0;
  70   self->write_buffer_offset= 0;
  71   self->address_info= NULL;
  72   self->address_info_next= NULL;
  73
  74   self->state= MEMCACHED_SERVER_STATE_NEW;
  75   self->next_retry= 0;
  76
  77   self->root= root;
  78   if (root)
  79   {
  80     self->version= ++root->server_info.version;
  81   }
  82   else
  83   {
  84     self->version= UINT_MAX;
  85   }
  86   self->limit_maxbytes= 0;
  87   self->hostname(hostname);
  88 }
  89
  90 static memcached_instance_st* _server_create(memcached_instance_st* self, const memcached_st *memc)
  91 {
  92   if (self == NULL)
  93   {
  94    self= libmemcached_xmalloc(memc, memcached_instance_st);
  95
  96     if (self == NULL)
  97     {
  98       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  99     }
 100
 101     self->options.is_allocated= true;
 102   }
 103   else
 104   {
 105     self->options.is_allocated= false;
 106   }
 107
 108   self->options.is_initialized= true;
 109
 110   return self;
 111 }
 112
 113 void memcached_instance_st::events(short arg)
 114 {
 115   if ((_events | arg) == _events)
 116   {
 117     return;
 118   }
 119
 120   _events|= arg;
 121 }
 122
 123 void memcached_instance_st::revents(short arg)
 124 {
 125   if (arg)
 126   {
 127     options.ready= true;
 128   }
 129
 130   _revents= arg;
 131   _events&= short(~arg);
 132 }
 133
 134 memcached_instance_st* __instance_create_with(memcached_st *memc,
 135                                                     memcached_instance_st* self,
 136                                                     const memcached_string_t& hostname,
 137                                                     const in_port_t port,
 138                                                     uint32_t weight,
 139                                                     const memcached_connection_t type)
 140 {
 141   if (memcached_is_valid_servername(hostname) == false)
 142   {
 143     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 144     return NULL;
 145   }
 146
 147   self= _server_create(self, memc);
 148
 149   if (self == NULL)
 150   {
 151     return NULL;
 152   }
 153
 154   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 155
 156   if (memc and memcached_is_udp(memc))
 157   {
 158     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 159     memcached_io_init_udp_header(self, 0);
 160   }
 161
 162   return self;
 163 }
 164
 165 void __instance_free(memcached_instance_st* self)
 166 {
 167   memcached_quit_server(self, false);
 168
 169   self->clear_addrinfo();
 170   assert(self->address_info_next == NULL);
 171
 172   memcached_error_free(*self);
 173
 174   if (memcached_is_allocated(self))
 175   {
 176     libmemcached_free(self->root, self);
 177   }
 178   else
 179   {
 180     self->options.is_initialized= false;
 181   }
 182 }
 183
 184 void memcached_instance_free(memcached_instance_st* self)
 185 {
 186   if (self)
 187   {
 188     __instance_free(self);
 189   }
 190 }
 191
 192 memcached_return_t memcached_server_cursor(const memcached_st* shell,
 193                                            const memcached_server_fn *callback,
 194                                            void *context,
 195                                            uint32_t number_of_callbacks)
 196 {
 197   const Memcached* memc= memcached2Memcached(shell);
 198   memcached_return_t rc;
 199   if (memcached_failed(rc= initialize_const_query(memc)))
 200   {
 201     return rc;
 202   }
 203
 204   size_t errors= 0;
 205   for (uint32_t x= 0; x < memcached_instance_list_count(memc); x++)
 206   {
 207     memcached_instance_st* instance= memcached_instance_by_position(memc, x);
 208
 209     for (uint32_t y= 0; y < number_of_callbacks; y++)
 210     {
 211       memcached_return_t ret= (*callback[y])(memc, instance, context);
 212
 213       if (memcached_failed(ret))
 214       {
 215         errors++;
 216         continue;
 217       }
 218     }
 219   }
 220
 221   return errors ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 222 }
 223
 224 memcached_return_t memcached_server_execute(memcached_st *memc,
 225                                             memcached_server_execute_fn callback,
 226                                             void *context)
 227 {
 228   if (callback == NULL)
 229   {
 230     return MEMCACHED_INVALID_ARGUMENTS;
 231   }
 232
 233   bool some_errors= false;;
 234   for (uint32_t x= 0; x < memcached_instance_list_count(memc); x++)
 235   {
 236     memcached_instance_st* instance= memcached_instance_fetch(memc, x);
 237
 238     memcached_return_t rc= (*callback)(memc, instance, context);
 239     if (rc == MEMCACHED_INVALID_ARGUMENTS)
 240     {
 241       return rc;
 242     }
 243     else if (memcached_fatal(rc))
 244     {
 245       some_errors= true;
 246     }
 247   }
 248
 249   (void)some_errors;
 250   return MEMCACHED_SUCCESS;
 251 }
 252
 253 const memcached_instance_st * memcached_server_by_key(memcached_st *shell,
 254                                                      const char *key,
 255                                                      size_t key_length,
 256                                                      memcached_return_t *error)
 257 {
 258   Memcached* memc= memcached2Memcached(shell);
 259   memcached_return_t unused;
 260   if (error == NULL)
 261   {
 262     error= &unused;
 263   }
 264
 265
 266   memcached_return_t rc;
 267   if (memcached_failed(rc= initialize_const_query(memc)))
 268   {
 269     *error= rc;
 270     return NULL;
 271   }
 272
 273   if (memcached_failed((memcached_key_test(*memc, (const char **)&key, &key_length, 1))))
 274   {
 275     *error= memcached_last_error(memc);
 276     return NULL;
 277   }
 278
 279   uint32_t server_key= memcached_generate_hash(memc, key, key_length);
 280   return memcached_instance_by_position(memc, server_key);
 281 }
 282
 283 /*
 284   If we do not have a valid object to clone from, we toss an error.
 285 */
 286 static memcached_instance_st* memcached_instance_clone(memcached_instance_st* source)
 287 {
 288   /* We just do a normal create if source is missing */
 289   if (source == NULL)
 290   {
 291     return NULL;
 292   }
 293
 294   memcached_string_t hostname_= { memcached_string_make_from_cstr(source->hostname()) };
 295   return __instance_create_with(source->root,
 296                                 NULL,
 297                                 hostname_,
 298                                 source->port(), source->weight,
 299                                 source->type);
 300 }
 301
 302 void set_last_disconnected_host(memcached_instance_st* self)
 303 {
 304   assert(self->root);
 305   if (self->root)
 306   {
 307     if (memcached_server_get_last_disconnect(self->root) and
 308         memcached_server_get_last_disconnect(self->root)->version == self->version)
 309     {
 310       return;
 311     }
 312
 313     // const_cast
 314     memcached_st *root= (memcached_st *)self->root;
 315
 316     memcached_instance_free((memcached_instance_st*)(root->last_disconnected_server));
 317
 318     // We set is_parsing so that no lookup happens
 319     root->state.is_parsing= true;
 320     root->last_disconnected_server= memcached_instance_clone(self);
 321     root->state.is_parsing= false;
 322
 323     ((memcached_instance_st*)memcached_server_get_last_disconnect(root))->version= self->version;
 324   }
 325 }
 326
 327 const memcached_instance_st * memcached_server_get_last_disconnect(const memcached_st *shell)
 328 {
 329   const Memcached* self= memcached2Memcached(shell);
 330   if (self)
 331   {
 332     return (const memcached_instance_st *)self->last_disconnected_server;
 333   }
 334
 335   return 0;
 336 }
 337
 338 void memcached_instance_next_retry(const memcached_instance_st * self, const time_t absolute_time)
 339 {
 340   WATCHPOINT_ASSERT(self);
 341   if (self)
 342   {
 343     ((memcached_instance_st*)self)->next_retry= absolute_time;
 344   }
 345 }
 346
 347 bool memcached_instance_st::valid() const
 348 {
 349   if (fd == INVALID_SOCKET)
 350   {
 351     return false;
 352   }
 353
 354   return true;
 355 }
 356
 357 bool memcached_instance_st::is_shutting_down() const
 358 {
 359   return options.is_shutting_down;
 360 }